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No, tanin is the color that leaches out when you first put the driftwood in the tank. That is more likely the wood itself, soft because it has been in water for so long, or bio-film that has collected on the wood.

When I go fishing I just place a sharp rock in the water and sit there waiting for all the dead fish to float to the top... KingfisherBrutal honesty will be shown on this screen.I think my fish is adjusting well to the four gallon, He's laying on his side attempting to go to sleep on the bottom of the gravel.Tolerance is a great thing to have, so is the ability to shut up.I can explain it to you, but I can't understand it for you.

I have tons of manzanita in my tank and take it all out for a good scrubing about once every six months. I have low lighting and no plants so not much of an algae problem. don't think you will have a problem, but it would probably be best to clean them every now and then.